Question

fx=x3-1 find x if fx 215​

Answer 1

Answer:

644

Step-by-step explanation:

fx=215

f=215×3-1

f=645-1

f=644

Answer 2

Answer:

X=6

Step-by-step explanation:

fx=x3-1

fx=215

215=x3-1

When - 1 comes to LHS it becomes +1

So 216=x3

LCM of 216 is 2.2.2.3.3.3

So it can also write as 63( 6 cube)

Then x =6